Rotor punching sheet, rotor core, rotor, motor and vehicle

Abstract

The utility model relates to a rotor punching sheet, a rotor core, a rotor, a motor and a vehicle, the rotor punching sheet is provided with a plurality of magnetic pole groove groups which are sequentially arranged along the circumferential direction of the rotor punching sheet, each magnetic pole groove group comprises a first accommodating groove and a second accommodating groove, and the first accommodating grooves and the second accommodating grooves are used for placing permanent magnets; the first containing groove, the second containing groove and the respective circle centers are located on the two sides of the symmetry axis respectively. According to the rotor punching sheet, the first accommodating groove and the circle center of the first accommodating groove are located on the two sides of the symmetry axis respectively, and the second accommodating groove which is symmetrical to the first accommodating groove relative to the symmetry axis and the circle center of the second accommodating groove are also located on the two sides of the symmetry axis respectively, so that the area proportion of the two accommodating grooves on the rotor punching sheet can be increased; therefore, the area proportion of the permanent magnets on the rotor punching sheet after the permanent magnets are arranged in the accommodating grooves is increased, the filling amount of the permanent magnets is improved, and the performance of the motor is improved on the premise of ensuring the power factor and the working efficiency of the motor.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and in particular, to a rotor punching sheet, a rotor core, a rotor, a motor and a vehicle. Background Art

[0002] The rotor core of a permanent magnet synchronous motor is composed of a plurality of rotor punchings stacked and arranged. The rotor punchings have magnetic steel slots for placing permanent magnets. The permanent magnets are an indispensable part of the permanent magnet synchronous motor. They can ensure the power factor and working efficiency of the motor, thereby ensuring the performance of the motor. In the related art, the arrangement of the magnetic steel slots and the permanent magnets makes the area of ​​the magnetic steel slots and the permanent magnets on the rotor punchings account for a low proportion, especially in the radial direction, and the space on the rotor punchings cannot be fully utilized to set the permanent magnets. Utility Model Content

[0003] The purpose of the present disclosure is to provide a rotor punching, a rotor core, a rotor, a motor and a vehicle to increase the radial area occupied by the accommodating slot and the permanent magnet therein in the rotor punching, so as to at least partially solve the above-mentioned technical problems.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a rotor punching, having a plurality of magnetic pole slot groups arranged in sequence along the circumference of the rotor punching, the magnetic pole slot groups comprising: a first accommodating slot for accommodating at least a portion of a permanent magnet, at least a portion of the slot wall of the first accommodating slot having a first type of arc surface with the first type of slot body axis as the rotation axis; and a second accommodating slot for accommodating at least a portion of a permanent magnet, at least a portion of the slot wall of the second accommodating slot having a second type of arc surface with the second type of slot body axis as the rotation axis, the second accommodating slot and the first accommodating slot are symmetrically arranged relative to a first reference plane, the first accommodating slot and the first type of slot body axis are respectively located on both sides of the first reference plane, the second accommodating slot and the second type of slot body axis are respectively located on both sides of the first reference plane, and the first reference plane is located on one of the rotor radial directions of the rotor punching.

[0005] Optionally, the axes of the first-type groove bodies of the plurality of the first accommodating grooves coincide with each other; and the axes of the second-type groove bodies of the plurality of the second accommodating grooves coincide with each other.

[0006] Optionally, the angle between two chord length planes corresponding to the symmetrically arranged first-type arc surface and the second-type arc surface is defined as a main magnetic circuit angle α, and the main magnetic circuit angle α satisfies p is the number of pole pairs of the rotor formed by the rotor punchings.

[0007] Optionally, a minimum radial distance between the first accommodating groove or the second accommodating groove close to the outer peripheral edge of the rotor punching sheet and the outer peripheral edge is greater than or equal to 2 mm and less than or equal to 4 mm.

[0008] Optionally, the minimum radius of the first type of arc surface of the first accommodating groove or the second type of arc surface of the second accommodating groove near the outer peripheral edge of the rotor punching is less than or equal to 6 / 5 of the radius of the rotor punching and greater than or equal to 4 / 5 of the radius of the rotor punching.

[0009] Optionally, the magnetic pole slot group includes a third accommodating slot for accommodating at least a portion of the permanent magnet, and at least a portion of the slot wall of the third accommodating slot has a third type of arc surface with a third type of slot body axis different from the first type of slot body axis and the second type of slot body axis as the rotation axis.

[0010] Optionally, the axis of the third type of slot body is located in the first reference plane, and the third accommodating slots are symmetrically arranged relative to the first reference plane.

[0011] Optionally, the first accommodating groove and the second accommodating groove arranged symmetrically about the first reference plane form a group of groove structures, and the first air grooves are formed at adjacent ends of the first accommodating groove and the second accommodating groove in at least one group of the groove structures; the third accommodating groove is arranged between the first accommodating groove and the second accommodating groove in at least one group of the groove structures; the first air groove has a first vacant arc surface with the axis of the third type of groove body as the rotation axis.

[0012] Optionally, the first vacant arc surface of the first air slot near the outer peripheral edge of the rotor punching is tangent to the first type of arc surface or the second type of arc surface near the outer peripheral edge of the first receiving groove or the second receiving groove that forms the first air slot at the end; the first vacant arc surface of the first air slot near the central axis of the rotor punching is tangent to the first type of arc surface or the second type of arc surface near the central axis of the first receiving groove or the second receiving groove that forms the first air slot at the end.

[0013] Optionally, a second air groove is formed at both ends of the third receiving groove, and the second air groove has a second vacant arc surface. The second vacant arc surface of the second air groove near the outer peripheral edge of the rotor punching is tangent to the first type of arc surface or the second type of arc surface near the outer peripheral edge of the adjacent first receiving groove or the second receiving groove; the second vacant arc surface of the second air groove near the central axis of the rotor punching is tangent to the first type of arc surface or the second type of arc surface near the central axis of the adjacent first receiving groove or the second receiving groove.

[0014] Optionally, the magnetic pole slot group includes a fourth accommodating slot, at least part of the slot wall of the fourth accommodating slot has a fourth type of arc surface with a fourth type of slot body axis as a rotation axis, the fourth type of slot body axis is located in the first reference plane, and the fourth accommodating slot is symmetrically arranged relative to the first reference plane.

[0015] Optionally, in the groove structure on the side close to the outer peripheral edge of the rotor punching, the intersection of the plane where the arc center line of the first type of arc surface of the first receiving groove and the first type of groove body axis are located and the plane where the arc center line of the second type of arc surface of the second receiving groove and the second type of groove body axis are located is the first intersection line, and the distance between the first intersection line and the fourth type of groove body axis is less than or equal to the radius of the fourth type of arc surface of the fourth receiving groove close to the center axis of the rotor punching, and greater than or equal to the radius of the fourth type of arc surface of the fourth receiving groove close to the outer peripheral edge of the rotor punching.

[0016] Optionally, the rotor punching sheet has a weight-reducing hole located between the first accommodating groove, the second accommodating groove and the fourth accommodating groove.

[0017] Optionally, the sum of the number of the fourth containing grooves and the number of the groove structures is at least 4.

[0018] Optionally, the magnetic pole slot group includes one fourth accommodating slot and is provided with three slot structures, and the fourth accommodating slot and the three slot structures are sequentially arranged from the side close to the outer peripheral edge of the rotor punching sheet to the side close to the central axis of the rotor punching sheet along the radial interval where the first reference plane is located, and the three slot structures sequentially form a first slot structure, a second slot structure and a third slot structure, the first slot structure includes the first air slot, and the second slot structure and the third slot structure both include the third accommodating slot.

[0019] Optionally, a reinforcement structure is provided between the two first air grooves of the first groove structure, between the third accommodating groove of the second groove structure and the first accommodating groove and / or the second accommodating groove, and between the third accommodating groove of the third groove structure and the first accommodating groove and / or the second accommodating groove.

[0020] Optionally, the thickness of the plurality of reinforcement structures gradually increases from a side close to the outer peripheral edge of the rotor punching to a side close to the central axis of the rotor punching.

[0021] Optionally, the ratio of the thickness of the reinforcement structure of the third slot structure to the thickness of the reinforcement structure of the second slot structure is less than or equal to 4 / 3 and greater than or equal to 1; the ratio of the thickness of the reinforcement structure of the second slot structure to the thickness of the reinforcement structure of the first slot structure is less than or equal to 3 / 2 and greater than or equal to 1; the thicknesses of the reinforcement structures of the first slot structure, the second slot structure and the third slot structure are all greater than or equal to one percent of the radius of the rotor punching.

[0022] According to a second aspect of the present disclosure, a rotor core is provided, comprising a plurality of rotor punchings as described above arranged in a stacked manner.

[0023] According to a third aspect of the present disclosure, a rotor is provided, comprising a permanent magnet and the above-mentioned rotor core.

[0024] Optionally, two adjacent magnetic pole slot groups are symmetrical with respect to a second reference plane, the second reference plane is located in another rotor radial direction of the rotor punching sheet, the intersection of the first reference plane and the outer peripheral edge of the rotor punching sheet is the second intersection line; the intersection of the second intersection line to the second reference plane and the second reference plane is the third intersection line; the minimum thickness of the permanent magnet is defined as H min , H min >L IJ / 2(n+1), where L IJ is the distance between the second intersection line and the third intersection line, and n is the number of magnetic barrier layers.

[0025] Optionally, the distance between the weight-reducing hole between the symmetrically arranged first accommodating slot and the second accommodating slot and the adjacent first accommodating slot or the second accommodating slot or the fourth accommodating slot is less than or equal to the minimum thickness of the permanent magnet, and greater than or equal to 2 / 3 of the minimum thickness of the permanent magnet; the distance between the third accommodating slot between the symmetrically arranged first accommodating slot and the second accommodating slot and the adjacent first accommodating slot or the second accommodating slot is less than or equal to the minimum thickness of the permanent magnet, and greater than or equal to 2 / 3 of the minimum thickness of the permanent magnet; the distance between the two first air slots between the symmetrically arranged first accommodating slot and the second accommodating slot is less than or equal to the minimum thickness of the permanent magnet, and greater than or equal to 2 / 3 of the minimum thickness of the permanent magnet.

[0026] Optionally, the ratio of the distance between the axis of the third type of slot body of the third accommodating slot between the symmetrically arranged first accommodating slot and the second accommodating slot to the center axis of the rotor punching to the radius of the rotor punching is less than or equal to 4 / 5 and greater than or equal to 2 / 3; the minimum radii of the two first vacant arc surfaces of the two first air slots at the adjacent ends of the first accommodating slot and the second accommodating slot on one side of the outer peripheral edge of the rotor punching are both less than or equal to twice the minimum thickness of the permanent magnet, and greater than or equal to the minimum thickness of the permanent magnet.

[0027] Optionally, there is a third accommodating groove between the first accommodating groove and the second accommodating groove on the side close to the central axis of the rotor punching sheet, and the thickness of the permanent magnet in the first accommodating groove or the second accommodating groove on the side close to the central axis of the rotor punching sheet is greater than or equal to 3 / 2 of the minimum thickness of the permanent magnet, and the thickness of the permanent magnet in the third accommodating groove is greater than or equal to 7 / 4 of the minimum thickness of the permanent magnet.

[0028] Optionally, the permanent magnet is a ferrite permanent magnet.

[0029] According to a fourth aspect of the present disclosure, a motor is provided, comprising the above-mentioned rotor.

[0030] A fifth aspect of the present disclosure provides a vehicle comprising the above-mentioned motor.

[0031] Through the above technical scheme, the first type of arc surface and the first type of slot body axis of the first accommodating groove on the rotor punching of the present invention are respectively located on both sides of the first reference plane, and the second type of arc surface and the second type of slot body axis of the second accommodating groove symmetrically arranged with respect to the first reference plane are also respectively located on both sides of the first reference plane. In this way, the area ratio of the two accommodating grooves in the radial direction of the rotor punching can be increased, and the area ratio of the permanent magnet in the accommodating groove in the radial direction of the rotor punching can be increased accordingly, thereby increasing the filling amount of the permanent magnet, thereby improving the performance of the motor while ensuring the power factor and working efficiency of the motor.

[0032] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0034] Figure 1 It is a schematic structural diagram of the magnetic pole slot group and the permanent magnet of the rotor punching provided by the embodiment of the present disclosure after being assembled;

[0035] Figure 2 is a schematic diagram of the slot body axis and slot structure of the magnetic pole slot group of the rotor punching provided by the embodiment of the present disclosure;

[0036] Figure 3 is a schematic diagram of intersection points, end points, angles and thicknesses on a magnetic pole slot group of a rotor punching provided by an embodiment of the present disclosure;

[0037] Figure 4 It is a schematic diagram of the structure of the magnetic pole slot group of the rotor punching provided in an embodiment of the present disclosure.

[0038] Description of Reference Numerals

[0039] 1-first receiving groove; 101-first type arc surface;

[0040] 2-second receiving groove; 201-second type arc surface;

[0041] 3-third receiving groove; 301-third type arc surface;

[0042] 4- fourth receiving groove; 401- fourth type arc surface;

[0043] 5-first air slot; 501-first vacant arc surface;

[0044] 6-weight reduction hole; 7-strengthening structure; 8-permanent magnet;

[0045] 9-slot structure; 901-first slot structure; 902-second slot structure; 903-third slot structure;

[0046] 10-second air slot; 1001-second vacant arc surface;

[0047] M-axis of the first type of tank; N-axis of the second type of tank; O-axis of the third type of tank; P-axis of the fourth type of tank;

[0048] H-first intersection line; I-second intersection line; J-third intersection line;

[0049] D-first reference plane; Q-second reference plane. DETAILED DESCRIPTION

[0050] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0051] In the present disclosure, unless otherwise stated, the terms "first", "second", "third", etc. used in the present disclosure are intended to distinguish one element from another and do not have order or importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be understood as limiting the present disclosure.

[0052] The rotor punching in the exemplary embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0053] refer to Figures 1 to 4 As shown, in the first aspect of the present disclosure, a rotor punching is provided, the rotor punching has a plurality of magnetic pole slot groups arranged in sequence along the circumference of the rotor punching, the magnetic pole slot groups include a first accommodating slot 1 and a second accommodating slot 2, wherein the first accommodating slot 1 is used to accommodate at least a portion of the permanent magnet 8, and at least a portion of the slot wall of the first accommodating slot 1 has a first type of arc surface 101 with the first type of slot body axis M as the rotation axis; the second accommodating slot 2 is also used to accommodate at least a portion of the permanent magnet 8, and at least a portion of the slot wall of the second accommodating slot 2 has a second type of arc surface 201 with the second type of slot body axis N as the rotation axis, the second accommodating slot 2 and the first accommodating slot 1 are symmetrically arranged relative to the first reference plane D, the first accommodating slot 1 and the first type of slot body axis M are respectively located on both sides of the first reference plane D, the second accommodating slot 2 and the second type of slot body axis N are respectively located on both sides of the first reference plane D, and the first reference plane D is located on one of the rotor radial directions of the rotor punching. That is, the first type of arc surface 101 of the first receiving slot 1 is located on one side of the first reference plane D, and the first type of slot body axis M is located on the other side of the first reference plane D. Similarly, the second type of arc surface 201 of the second receiving slot 2 symmetrically arranged with the first receiving slot 1 about the first reference plane D is located on the other side of the first reference plane D, and the second type of slot body axis N is located on one side of the first reference plane D. This arrangement can increase the space occupied by the receiving slot on the rotor punching. Compared with the related art in which the first receiving slot 1 and the second receiving slot 2 are arranged with the same type of slot body axis or the first receiving slot 1 and the second receiving slot 2 and their respective corresponding slot body axes are located on the same side of the first reference plane D, the first receiving slot 1 and the second receiving slot 2 disclosed in the present invention can further increase the area ratio of the first receiving slot 1 and the second receiving slot 2 in the radial direction of the rotor punching, thereby increasing the area ratio of the permanent magnet 8 installed in the receiving slot on the rotor punching, and increasing the filling amount of the permanent magnet 8, thereby ensuring the power factor and working efficiency of the motor and improving the performance of the motor.

[0054] In some embodiments of the present disclosure, Figures 1 to 4As shown, the first type slot body axes M of the plurality of first receiving slots 1 coincide with each other; the second type slot body axes N of the plurality of second receiving slots 2 coincide with each other. By increasing the number of the first receiving slots 1 and the second receiving slots 2, the area proportion of the permanent magnet 8 on the rotor punching and the number of magnetic barrier layers of the rotor punching are further increased, thereby improving the utilization rate of the magnetic resistance torque and the performance of the motor.

[0055] In some embodiments, Figure 3 As shown in the figure, the angle between the two chord length planes corresponding to the symmetrically arranged first type arc surface 101 and the second type arc surface 201 is defined as the main magnetic circuit angle α, and the main magnetic circuit angle α satisfies p is the number of pole pairs of the rotor formed by the rotor punching. The first receiving slot 1 and the second receiving slot 2 arranged in this way can improve the magnetic field gathering effect of the rotor, increase the proportion of the permanent magnet 8 in the magnetic circuit, and ensure the utilization rate of the rotor core. For example, if the rotor punching disclosed in the present invention is an 8-pole rotor punching, then the number of motor pole pairs is 4 pairs, and the value range of the main magnetic circuit angle α is between 45°-90°.

[0056] Among them, Figure 3 As shown, the minimum radial distance between the first receiving groove 1 or the second receiving groove 2 near the outer peripheral edge of the rotor punching and the outer peripheral edge is greater than or equal to 2 mm and less than or equal to 4 mm. That is, the distance between the first receiving groove 1 and the second receiving groove 2 and the outer edge of the rotor punching is limited to avoid the situation where the first receiving groove 1 and the second receiving groove 2 are too close or too far from the outer edge of the rotor punching, so as to avoid the easily demagnetized area on the rotor punching while ensuring the strength of the rotor punching, enhance the magnetic field effect of the rotor, increase the proportion of the permanent magnet 8 in the magnetic circuit, and ensure the utilization rate of the rotor core. In addition, as Figures 1 to 3 As shown, the minimum radius of the first type of arc surface 101 of the first receiving groove 1 or the second type of arc surface 201 of the second receiving groove 2 near the outer peripheral edge of the rotor punching is less than or equal to 6 / 5 of the radius of the rotor punching, and greater than or equal to 4 / 5 of the radius of the rotor punching. That is, the size and specific position of the first receiving groove 1 and the second receiving groove 2 near the outer peripheral edge of the rotor punching are further limited, and then the size and position of the permanent magnet 8 in the first receiving groove 1 and the second receiving groove 2 located at the outer peripheral edge of the rotor punching are limited, thereby further improving the magnetic field gathering effect of the rotor, increasing the proportion of the permanent magnet 8 in the magnetic circuit, and ensuring the utilization rate of the rotor core.

[0057] In some embodiments, Figure 3 and Figure 4As shown, the magnetic pole slot group includes a third accommodating slot 3, and the third accommodating slot 3 is used to accommodate at least a part of the permanent magnet 8. At least part of the slot wall of the third accommodating slot 3 has a third type of arc surface 301 with a third type of slot body axis O different from the first type slot body axis M and the second type slot body axis N as the rotation axis. The third accommodating slot 3 can be arranged so that more permanent magnets 8 are arranged on the rotor punching, and the proportion of the permanent magnets 8 on the rotor punching is increased, thereby improving the performance of the motor, and because the third accommodating slot 3 has the third type of arc surface 301 with the third type of slot body axis O as the rotation axis, it can also increase the length of the third accommodating slot 3 in the radial direction of the rotor punching, thereby ensuring the power factor and working efficiency of the motor.

[0058] In addition, the axis O of the third type slot body is located in the first reference plane D, and the third receiving slot 3 is arranged symmetrically relative to the first reference plane D. In order to utilize the area on the rotor punching as much as possible, the proportion of the permanent magnet 8 on the rotor punching is maximized, and the performance of the motor is improved. Figure 1 and Figure 2 As shown, the first receiving groove 1 and the second receiving groove 2 symmetrically arranged about the first reference plane D form a group of groove structures 9, and the first air grooves 5 are arranged at the adjacent ends of the first receiving grooves 1 and the second receiving grooves 2 in at least one group of groove structures 9; the third receiving groove 3 is arranged between the first receiving grooves 1 and the second receiving grooves 2 in at least one group of groove structures 9; the first air groove 5 has a first vacant arc surface 501 with the third type of groove body axis O as the rotation axis. In addition to reducing the weight of the rotor punching, the first air groove 5 can also allow the cooling oil to flow inside the rotor core through the first air groove 5, thereby ensuring the heat dissipation effect of the rotor core.

[0059] In addition, it should be noted that the opening direction of the groove structure 9 disclosed in the present invention can be toward the outer peripheral edge of the rotor punching; of course, in some embodiments not shown in the figure, the opening direction of the groove structure 9 can also be toward the central axis of the rotor punching.

[0060] Among them, the first vacant arc surface 501 of the first air slot 5 near the outer peripheral edge of the rotor punching is tangent to the first type of arc surface 101 or the second type of arc surface 201 near the outer peripheral edge of the first receiving slot 1 or the second receiving slot 2 forming the first air slot 5 at the end; the first vacant arc surface 501 of the first air slot 5 near the central axis of the rotor punching is tangent to the first type of arc surface 101 or the second type of arc surface 201 near the central axis of the first receiving slot 1 or the second receiving slot 2 forming the first air slot 5 at the end. In this way, the first receiving slot 1 and the second receiving slot 2 arranged adjacent to the first air slot 5 and the permanent magnet 8 arranged in the first receiving slot 1 and the second receiving slot 2 can form an arched structure, which is conducive to dispersing the stress on the rotor punching, thereby improving the strength of the rotor punching, ensuring that it has a better magnetic field concentration effect, optimizing the air gap magnetic flux density, and improving the performance of the motor.

[0061] In addition, if Figure 1 , Figure 3 and Figure 4 As shown, a second air slot 10 is formed at both ends of the third receiving slot 3, and the second air slot 10 has a second vacant arc surface 1001. The second vacant arc surface 1001 of the second air slot 10 near the outer peripheral edge of the rotor punching is tangent to the first type of arc surface 101 or the second type of arc surface 201 near the outer peripheral edge of the adjacent first receiving slot 1 or second receiving slot 2; the second vacant arc surface 1001 of the second air slot 10 near the central axis of the rotor punching is tangent to the first type of arc surface 101 or the second type of arc surface 201 near the central axis of the adjacent first receiving slot or second receiving slot 2. In this way, each of the first receiving slot 1 and the second receiving slot 2 can form an arch structure, thereby dispersing the stress on the rotor punching, improving the strength of the rotor punching, ensuring that it has a better magnetic field concentration effect, optimizing the air gap magnetic flux density, and improving the performance of the motor. In some embodiments of the present disclosure, Figure 2 As shown, the magnetic pole slot group includes a fourth receiving slot 4, at least part of the slot wall of the fourth receiving slot 4 has a fourth type of arc surface 401 with the fourth type of slot body axis P as the rotation axis, the fourth type of slot body axis P is located in the first reference plane D, and the fourth receiving slot 4 is symmetrically arranged relative to the first reference plane D. By arranging the fourth receiving slot 4 on the rotor punching, the area occupied by the permanent magnet 8 on the rotor punching is increased, so as to ensure the power factor and working efficiency of the motor and improve the performance of the motor. In addition, as Figure 3 and Figure 4As shown, in the slot structure 9 on one side close to the peripheral edge of the rotor punching, the plane where the arc center line of the first type of arc surface 101 of the first receiving slot 1 and the first type of slot body axis M are located and the plane where the arc center line of the second type of arc surface 201 of the second receiving slot 2 and the second type of slot body axis N are located intersects as the first intersection line H, and the distance between the first intersection line H and the fourth type of slot body axis P can be less than or equal to the radius of the fourth type of arc surface 401 of the fourth receiving slot 4 close to the central axis of the rotor punching, and greater than or equal to the radius of the fourth type of arc surface 401 of the fourth receiving slot 4 close to the peripheral edge of the rotor punching. Limiting the position of the fourth receiving slot 4 on the rotor punching can prevent the fourth receiving slot 4 from being too close to the peripheral edge of the rotor punching, ensure the magnetic field gathering effect of the rotor, increase the proportion of the permanent magnet 8 in the magnetic circuit, and improve the performance of the motor.

[0062] It should be noted that the distance between one end of the first receiving groove 1 and / or the second receiving groove 2 close to the outer peripheral edge of the rotor punching and the central axis of the rotor punching can be defined as a positioning radius. A positioning virtual circle can be formed with the position of the central axis of the rotor punching as the center of the circle and the positioning radius as the radius. The arc center line of the first type of arc surface 101 of the first receiving groove 1 and the arc center line of the second type of arc surface 201 of the second receiving groove 2 intersect with the positioning virtual circle respectively to form a first positioning point and a second positioning point. The plane where the first positioning point and the second positioning point are located intersects with the first intersection line H to form a third positioning point. Therefore, the position of the fourth type of slot body axis P can be determined by the first positioning point, the second positioning point and the third positioning point, so as to facilitate the subsequent positioning of the fourth receiving groove 4.

[0063] In some embodiments, Figure 1 As shown, since there is a large vacant space between the first accommodating slot 1, the second accommodating slot 2 and the fourth accommodating slot 4, a weight-reducing hole 6 can be formed between the first accommodating slot 1, the second accommodating slot 2 and the fourth accommodating slot 4. The weight-reducing hole 6 will not affect the electromagnetic performance of the motor and can pass cooling oil to cool the rotor core, thereby reducing the weight of the rotor core as much as possible while ensuring the heat dissipation performance of the rotor core.

[0064] In some embodiments, Figure 1 As shown, the sum of the number of the fourth receiving slots 4 and the number of the slot structures 9 is at least 4, that is, the number of magnetic barrier layers on the rotor punching is 4. In the case of 4 magnetic barrier layers, the torque of the motor is significantly improved. As the number of magnetic barrier layers continues to increase, the torque improvement of the motor gradually decreases. Specifically, the number of magnetic barrier layers is preferably between 4 and 6. Since the permanent magnets 8 on the fourth receiving slots 4 play a small role in improving the performance of the motor, even if the overall number of magnetic barrier layers is greater than 4, only one fourth receiving slot 4 can be provided, and the number of slot structures 9 can be increased accordingly. In some embodiments of the present disclosure, such as Figure 2As shown, the magnetic pole slot group includes a fourth receiving slot 4 and is provided with three slot structures 9. The fourth receiving slot 4 and the three slot structures 9 are sequentially arranged from the side close to the outer peripheral edge of the rotor punching to the side close to the central axis of the rotor punching along the radial interval where the first reference plane D is located. The three slot structures 9 sequentially form a first slot structure 901, a second slot structure 902 and a third slot structure 903. The first slot structure 901 includes a first air slot 5, and the second slot structure 902 and the third slot structure 903 both include a third receiving slot 3. That is, the vacant space between the first receiving slot 1 and the second receiving slot 2 of the first slot structure 901 close to the outer peripheral edge of the rotor punching is small, so only the first air slot 5 can be provided, and the vacant space between the first receiving slot 1 and the second receiving slot 2 in the second slot structure 902 and the third slot structure 903 is large, and the third receiving slot 3 can be provided to increase the proportion of the permanent magnet 8 on the rotor punching, thereby ensuring the power factor and working efficiency of the motor and improving the performance of the motor.

[0065] In order to ensure the structural strength of the rotor punchings and prevent the rotor core composed of multiple rotor punchings from being deformed or even broken due to centrifugal force during high-speed rotation, such as Figure 1 and Figure 2 As shown, a reinforcement structure 7 is provided between the two first air grooves 5 of the first groove structure 901 of the present invention, between the third receiving groove 3 of the second groove structure 902 and the first receiving groove 1 and / or the second receiving groove 2, and between the third receiving groove 3 of the third groove structure 903 and the first receiving groove 1 and / or the second receiving groove 2, thereby ensuring the safety and stability of the motor.

[0066] Among them, Figure 1 As shown, since the stress on the area close to the central axis of the rotor punching is relatively large, based on this, the thickness of the multiple reinforcement structures 7 can be gradually increased from the outer peripheral edge of the rotor punching to the central axis of the rotor punching to ensure the structural strength of the rotor punching. Specifically, as Figure 3 As shown, the ratio of the thickness of the reinforcing structure 7 of the third slot structure 903 to the thickness of the reinforcing structure 7 of the second slot structure 902 (i.e. Figure 3 The ratio of Z to Y in the figure can be less than or equal to 4 / 3 and greater than or equal to 1; the ratio of the thickness of the reinforcing structure 7 of the second groove structure 902 to the thickness of the reinforcing structure 7 of the first groove structure 901 (i.e. Figure 3 The ratio of Y to X in the figure can be less than or equal to 3 / 2 and greater than or equal to 1; the thickness of the reinforcement structure 7 of the first slot structure 901, the second slot structure 902 and the third slot structure 903 is greater than or equal to 1% of the radius of the rotor sheet. The reinforcement structure 7 arranged in this way can reduce the magnetic leakage of the rotor core while ensuring the strength of the rotor sheet structure, thereby ensuring the performance of the motor.

[0067] A second aspect of the present disclosure provides a rotor core, comprising a plurality of stacked rotor punchings, the rotor core having all the beneficial effects of the rotor punchings, which will not be described in detail in the present disclosure.

[0068] A third aspect of the present disclosure provides a rotor, including a permanent magnet 8 and the above-mentioned rotor core. The rotor includes all the beneficial effects of the above-mentioned rotor core, which will not be repeated in the present disclosure.

[0069] In some embodiments of the present disclosure, Figure 3 As shown, two adjacent magnetic pole slot groups are symmetrical with respect to the second reference plane Q, the second reference plane Q is in another rotor radial direction of the rotor punching, the intersection of the first reference plane D and the outer peripheral edge of the rotor punching is the second intersection line I; the intersection of the vertical plane from the second intersection line I to the second reference plane Q and the second reference plane Q is the third intersection line J; the minimum thickness of the permanent magnet 8 is defined as H min , H min >L IJ / 2(n+1), where L IJ is the distance between the second intersection line I and the third intersection line J, and n is the number of magnetic barrier layers. In this way, the minimum thickness of the permanent magnet 8 can be limited to ensure the magnetic properties of the permanent magnet 8, thereby ensuring the overall performance of the motor.

[0070] In some embodiments, Figure 1 and Figure 4 As shown, the distance between the weight-reducing hole 6 between the symmetrically arranged first accommodation groove 1 and the second accommodation groove 2 and the adjacent first accommodation groove 1 or the second accommodation groove 2 or the fourth accommodation groove 4 is less than or equal to the minimum thickness H of the permanent magnet 8. min , greater than or equal to the minimum thickness H of the permanent magnet 8 min The distance between the third receiving groove 3 and the adjacent first receiving groove 1 or second receiving groove 2 arranged symmetrically is less than or equal to the minimum thickness H of the permanent magnet 8. min , greater than or equal to the minimum thickness H of the permanent magnet 8 min The distance between the two first air slots 5 between the symmetrically arranged first receiving slot 1 and the second receiving slot 2 is less than or equal to the minimum thickness H of the permanent magnet 8. min , greater than or equal to the minimum thickness H of the permanent magnet 8 min That is, the positional relationship among the slot structure 9, the fourth accommodating slot 4, and the weight-reducing hole 6 is defined, so that the structural arrangement on the rotor punching sheet is more reasonable, and the performance of the motor is guaranteed.

[0071] In some embodiments of the present disclosure, Figure 2As shown, the ratio of the distance between the third type slot body axis O of the third receiving slot 3 between the symmetrically arranged first receiving slot 1 and the second receiving slot 2 to the central axis of the rotor punching to the radius of the rotor punching is less than or equal to 4 / 5 and greater than or equal to 2 / 3; the minimum radius of the two first vacant arc surfaces 501 of the first air slot 5 at the adjacent ends of the first receiving slot 1 and the second receiving slot 2 close to the outer peripheral edge of the rotor punching are both less than or equal to the minimum thickness H of the permanent magnet 8. min and is greater than or equal to the minimum thickness H of the permanent magnet 8. min The positions of the third receiving slot 3 and the first air slot 5 are limited, so that the third receiving slot 3 can be prevented from being too close to the central axis of the rotor punching or too close to the peripheral edge of the rotor punching, thereby ensuring the magnetism of the permanent magnet 8 in the third receiving slot 3.

[0072] In order to further increase the proportion of permanent magnets 8 on the rotor laminations and improve the performance of the motor, Figure 3 As shown, there is a third accommodating groove 3 between the first accommodating groove 1 and the second accommodating groove 2 on the side close to the central axis of the rotor punching, and the thickness of the permanent magnet 8 in the first accommodating groove 1 or the second accommodating groove 2 on the side close to the central axis of the rotor punching (i.e. Figure 3 The length of A shown in FIG) is greater than or equal to the minimum thickness H of the permanent magnet 8. min 3 / 2 of the thickness of the permanent magnet 8 in the third receiving groove 3 (i.e. Figure 3 The length of B shown in FIG) is greater than or equal to the minimum thickness H of the permanent magnet 8. min 7 / 4.

[0073] In some embodiments of the present disclosure, Figures 1 to 3 As shown, the permanent magnet 8 can be configured as a ferrite permanent magnet. Since the proportion of the permanent magnet 8 on the rotor is increased, the power factor and working efficiency of the motor are guaranteed, and the performance of the motor is improved. On this basis, even if the rare earth permanent magnet is replaced by a ferrite permanent magnet, the performance of the motor will not be affected, and the production cost of the motor can also be reduced.

[0074] A fourth aspect of the present disclosure provides a motor, comprising the above-mentioned rotor. Exemplarily, the motor may be a permanent magnet assisted synchronous reluctance motor, which has all the beneficial effects of the above-mentioned rotor, and the present disclosure will not elaborate on them here.

[0075] A fifth aspect of the present disclosure provides a vehicle including the above-mentioned motor, which has all the technical benefits of the above-mentioned motor, and the present disclosure will not elaborate on them here.

[0076] In summary, the present disclosure exemplarily illustrates the working principle of a rotor punching.

[0077] A magnetic pole slot group of the rotor punching sheet disclosed in the present invention has a first accommodating slot 1, a second accommodating slot 2, a third accommodating slot 3 and a fourth accommodating slot 4. The first type arc surface 101 of the first accommodating slot 1 and the second type arc surface 201 of the second accommodating slot 2 are symmetrically arranged about the first reference plane D, and the number of both is three. The three first accommodating slots 1 are arranged at intervals and have the same first type slot body axis M. The three first accommodating slots 1 and the first type slot body axis M are respectively located on both sides of the first reference plane D. Similarly, the three second accommodating slots 2 arranged in one-to-one correspondence with the first accommodating slots 1 have the same The second type slot body axis N is the same, and the three second receiving slots 2 and the second type slot body axis N are also located on both sides of the first reference plane D, respectively. This can increase the proportion of the first receiving slot 1 and the second receiving slot 2 on the rotor punching, especially the radial length of the two in the rotor punching, thereby increasing the proportion of the permanent magnet 8 on the rotor punching after being arranged in the first receiving slot 1 and the second receiving slot 2, ensuring the power factor and working efficiency of the motor, and improving the performance of the motor. Based on this, the present disclosure can also reduce or even eliminate the need to use high-cost rare earth permanent magnets, reducing the production cost of the motor. The third receiving slot 3 set between the first receiving slot 1 and the second receiving slot 2 and the fourth receiving slot 4 close to the outer peripheral edge of the rotor punching can further increase the proportion of the permanent magnet 8 on the rotor punching to further improve the performance of the motor.

[0078] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0079] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0080] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A rotor punching, characterized in that: A plurality of magnetic pole slot groups are sequentially arranged along the circumferential direction of the rotor punching sheet, and the magnetic pole slot groups include: A first accommodating groove, for accommodating at least a portion of the permanent magnet, wherein at least a portion of the groove wall of the first accommodating groove has a first-type arc surface with a first-type groove body axis as a rotation axis; and A second accommodating groove is used to accommodate at least a portion of the permanent magnet. At least a portion of the groove wall of the second accommodating groove has a second type of arc surface with the second type of groove body axis as the rotation axis. The second accommodating groove and the first accommodating groove are symmetrically arranged relative to a first reference plane. The first accommodating groove and the first type of groove body axis are respectively located on both sides of the first reference plane. The second accommodating groove and the second type of groove body axis are respectively located on both sides of the first reference plane. The first reference plane is located on one of the rotor radial directions of the rotor punchings.

2. The rotor punching according to claim 1, characterized in that: The axes of the first type of slot bodies of the plurality of the first containing slots coincide with each other; The axes of the second-type groove bodies of the plurality of the second containing grooves coincide with each other.

3. The rotor punching according to claim 1 or 2, characterized in that: The angle formed between the two chord length planes corresponding to the first type of arc surface and the second type of arc surface respectively arranged symmetrically is defined as the main magnetic circuit angle α, and the main magnetic circuit angle α satisfies p is the number of pole pairs of the rotor formed by the rotor punchings.

4. The rotor punching according to claim 3, characterized in that: A minimum radial distance between the first accommodating groove or the second accommodating groove close to the outer peripheral edge of the rotor punching sheet and the outer peripheral edge is greater than or equal to 2 mm and less than or equal to 4 mm.

5. The rotor punching according to claim 1 or 2, characterized in that: The minimum radius of the first type of arc surface of the first receiving groove or the second type of arc surface of the second receiving groove near the outer peripheral edge of the rotor punching is less than or equal to 6 / 5 of the radius of the rotor punching and greater than or equal to 4 / 5 of the radius of the rotor punching.

6. The rotor punching according to claim 1 or 2, characterized in that: The magnetic pole slot group includes a third accommodating slot for accommodating at least a portion of the permanent magnet. At least a portion of the slot wall of the third accommodating slot has a third type of arc surface with a third type of slot body axis different from the first type of slot body axis and the second type of slot body axis as the rotation axis.

7. The rotor punching according to claim 6, characterized in that: The axis of the third type slot body is located in the first reference plane, and the third accommodating slots are arranged symmetrically relative to the first reference plane.

8. The rotor punching according to claim 6, characterized in that: The first receiving grooves and the second receiving grooves symmetrically arranged about the first reference plane form a group of groove structures, and adjacent ends of the first receiving grooves and the second receiving grooves in at least one group of the groove structures are both formed with first air grooves; The third accommodating groove is arranged between the first accommodating groove and the second accommodating groove in at least one group of the groove structures; The first air slot has a first idle arc surface with the axis of the third type slot body as the rotation axis.

9. The rotor punching according to claim 8, characterized in that: The first vacant arc surface of the first air slot near the outer peripheral edge of the rotor punching sheet is tangent to the first type of arc surface or the second type of arc surface near the outer peripheral edge of the first accommodating slot or the second accommodating slot whose end forms the first air slot; The first vacant arc surface of the first air slot close to the central axis of the rotor punching sheet is tangent to the first type of arc surface or the second type of arc surface close to the central axis of the first accommodating slot or the second accommodating slot forming the first air slot at the end.

10. The rotor punching according to claim 6, characterized in that: The second air grooves are formed at both ends of the third receiving groove, and the second air grooves have a second vacant arc surface. The second vacant arc surface of the second air slot near the outer peripheral edge of the rotor punching sheet is tangent to the first type of arc surface or the second type of arc surface of the adjacent first accommodating slot or the second accommodating slot near the outer peripheral edge; The second vacant arc surface of the second air slot close to the central axis of the rotor punching sheet is tangent to the first type of arc surface or the second type of arc surface of the adjacent first accommodating slot or the second accommodating slot close to the central axis.

11. The rotor punching according to claim 8, characterized in that: The magnetic pole slot group includes a fourth accommodating slot, at least part of the slot wall of the fourth accommodating slot has a fourth type of arc surface with the fourth type of slot body axis as the rotation axis, the fourth type of slot body axis is located in the first reference plane, and the fourth accommodating slot is symmetrically arranged relative to the first reference plane.

12. The rotor punching according to claim 11, characterized in that: In the groove structure on one side close to the outer peripheral edge of the rotor punching sheet, The intersection of the plane where the arc center line of the first type of arc surface of the first receiving groove and the first type of groove body axis are located and the plane where the arc center line of the second type of arc surface of the second receiving groove and the second type of groove body axis are located is the first intersection line, and the distance between the first intersection line and the fourth type of groove body axis is less than or equal to the radius of the fourth type of arc surface of the fourth receiving groove close to the central axis of the rotor punching, and is greater than or equal to the radius of the fourth type of arc surface of the fourth receiving groove close to the outer peripheral edge of the rotor punching.

13. The rotor punching according to claim 11, characterized in that: The rotor punching sheet has a weight-reducing hole located between the first accommodating groove, the second accommodating groove and the fourth accommodating groove.

14. The rotor punching according to claim 11, characterized in that: The sum of the number of the fourth containing grooves and the number of the groove structures is at least 4.

15. The rotor punching according to claim 11, characterized in that: The magnetic pole slot group includes a fourth accommodating slot and is provided with three slot structures. The fourth accommodating slot and the three slot structures are sequentially arranged from the side close to the outer peripheral edge of the rotor punching to the side close to the central axis of the rotor punching along the radial direction where the first reference plane is located. The three slot structures sequentially form a first slot structure, a second slot structure and a third slot structure. The first slot structure includes the first air slot, and the second slot structure and the third slot structure both include the third accommodating slot.

16. The rotor punching according to claim 15, characterized in that: A reinforcement structure is provided between the two first air grooves of the first groove structure, between the third receiving groove of the second groove structure and the first receiving groove and / or the second receiving groove, and between the third receiving groove of the third groove structure and the first receiving groove and / or the second receiving groove.

17. The rotor punching according to claim 16, characterized in that: The thickness of the plurality of reinforcement structures gradually increases from a side close to the outer peripheral edge of the rotor punching to a side close to the central axis of the rotor punching.

18. The rotor punching according to claim 17, characterized in that: A ratio of a thickness of the reinforcement structure of the third groove structure to a thickness of the reinforcement structure of the second groove structure is less than or equal to 4 / 3 and greater than or equal to 1; A ratio of a thickness of the reinforcement structure of the second groove structure to a thickness of the reinforcement structure of the first groove structure is less than or equal to 3 / 2 and greater than or equal to 1; The thickness of the reinforcement structure of the first slot structure, the second slot structure and the third slot structure is greater than or equal to 1 percent of the radius of the rotor punching sheet.

19. A rotor core, characterized in that: A rotor lamination comprising a plurality of laminations as claimed in any one of claims 1 to 18 arranged in a stacked manner.

20. A rotor, characterized in that: The invention comprises a permanent magnet and the rotor core as claimed in claim 19.

21. The rotor according to claim 20, characterized in that Two adjacent magnetic pole slot groups are symmetrical with respect to a second reference plane, and the second reference plane is located in another rotor radial direction of the rotor punching sheet. The intersection of the first reference plane and the outer peripheral edge of the rotor punching sheet is a second intersection line; The intersection of the vertical plane from the second intersection line to the second reference plane and the second reference plane is the third intersection line; The minimum thickness of the permanent magnet is defined as H min , H min >L IJ / 2(n+1), where L IJ is the distance between the second intersection line and the third intersection line, and n is the number of magnetic barrier layers.

22. The rotor according to claim 21, characterized in that The distance between the weight-reducing hole between the symmetrically arranged first accommodating groove and the second accommodating groove and the adjacent first accommodating groove, the second accommodating groove or the fourth accommodating groove is less than or equal to the minimum thickness of the permanent magnet, and greater than or equal to 2 / 3 of the minimum thickness of the permanent magnet; A distance between a third accommodating groove between the symmetrically arranged first accommodating groove and the second accommodating groove and an adjacent first accommodating groove or the second accommodating groove is less than or equal to a minimum thickness of the permanent magnet and greater than or equal to 2 / 3 of the minimum thickness of the permanent magnet; The distance between the two first air slots between the symmetrically arranged first accommodating slot and the second accommodating slot is less than or equal to the minimum thickness of the permanent magnet and greater than or equal to 2 / 3 of the minimum thickness of the permanent magnet.

23. The rotor according to claim 22, characterized in that The ratio of the distance between the axis of the third type of slot body of the third accommodating slot between the first accommodating slot and the second accommodating slot which are symmetrically arranged to the central axis of the rotor punching to the radius of the rotor punching is less than or equal to 4 / 5 and greater than or equal to 2 / 3; The minimum radii of the two first vacant arc surfaces of the two first air grooves at the adjacent ends of the first accommodating groove and the second accommodating groove on one side of the outer peripheral edge of the rotor punching close to the outer peripheral edge of the rotor punching are both less than or equal to twice the minimum thickness of the permanent magnet, and greater than or equal to the minimum thickness of the permanent magnet.

24. The rotor according to claim 21, characterized in that There is a third accommodating groove between the first accommodating groove and the second accommodating groove on the side close to the central axis of the rotor punching, the thickness of the permanent magnet in the first accommodating groove or the second accommodating groove on the side close to the central axis of the rotor punching is greater than or equal to 3 / 2 of the minimum thickness of the permanent magnet, and the thickness of the permanent magnet in the third accommodating groove is greater than or equal to 7 / 4 of the minimum thickness of the permanent magnet.

25. The rotor according to claim 20, characterized in that The permanent magnet is a ferrite permanent magnet.

26. A motor, characterized in that: A rotor comprising any one of claims 20-25.

27. A vehicle, characterized in that: Includes the motor as claimed in claim 26.

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